Exergy 07.5-10 Chevrolet Duramax 6.6L LMM Sportsman CP3 Pump (LBZ Based)
The LMM Duramax in 2007.5-2010 Silverado and Sierra HD trucks is the last of the CP3-equipped pickups GM built before the LML went to the CP4.2. Many of these trucks now have well over 200,000 miles, and the original pump is often the reason for a P0087, a slow start, or a truck that will not hold power while towing. The Exergy Sportsman E04 10405 is a new LBZ-based CP3 made for the LMM. It replaces the factory pump with no core to return and no tune required.
On the LMM, the CP3 is a gear-driven, three-plunger pump that sends fuel to both common rails. The engine computer sets rail pressure by commanding the inlet metering valve (MPROP) on the pump, letting more or less fuel into the plungers. The LMM also has to supply extra fuel for regeneration of its diesel particulate filter, so a pump that is losing efficiency shows up as low power, rough regens and pressure codes long before it fails outright.
Exergy uses its LBZ-based Sportsman design for this truck. The pump has higher-flowing valves than stock and keeps adding flow past about 3,000 RPM, where Exergy says a stock CP3 stops climbing. It is rated from stock up to 650-plus horsepower, so it is a fit for an LMM with mild tuning or larger injectors as well as a stock replacement.
A healthy LMM pump can still set P0087 if it is starved. Check the fuel filter, look for air bubbles in a clear line at the filter head, and measure supply pressure under load. Watch MPROP current and rail pressure together: if the computer is asking for more fuel and the pressure will not respond with a good supply, the pump is worn. Also separate engine complaints from transmission ones. Our Allison 1000 limp mode guide explains what a slipping six-speed feels like, and the Allison valve body testing guide covers harsh or flared shifts that are easy to mistake for a power loss.
This listing is for 2007.5-2010 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD with the 6.6L LMM, part number E04 10405. Exergy's chart for the pump also includes the 6.6L Express and Savana 2500 and 3500 vans in the same years. It replaces Bosch 0 445 020 037, 0 445 020 105 and 0 986 437 332, and GM 97780161, 97720662, 97361351 and 8973613516. A 2007 Classic body truck has the LBZ, not the LMM, so use the LBZ version there. If you are unsure, send us your year and VIN. Our full Duramax fuel lineup sits under engine performance, and Allison parts are on the Allison 1000 page.
A truck that suddenly makes full power again puts more load on a high-mileage six-speed, so check the fluid against our Allison 1000 service specs while you are at it.
| Brand | Exergy |
| Part number | E04 10405 |
| Fits | Exergy 07.5-10 Chevrolet Duramax 6.6L LMM Sportsman CP3 Pump (LBZ Based) |
| Type | Injection Pumps & Controllers |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Only if it is the new-body 2007.5 truck with the LMM. 2007 Classic trucks used the LBZ and need the LBZ Sportsman. Check your engine RPO or send us the VIN.
Exergy's fitment chart lists the 2007-2010 Express and Savana 2500 and 3500 with the 6.6L. Match your old pump's Bosch or GM number to be sure.
A lift pump is not required. For full output Exergy recommends 150 GPH at 15 psi per pump, a higher pressure than it lists for the LB7 and LBZ versions.
No. Exergy says the Sportsman runs without significant supporting mods or tuning and is rated from stock up to 650-plus horsepower.
If your old pump made debris or the original valve is giving erratic rail pressure, yes. A contaminated MPROP can cause P0087 on a new pump.
